LeetCode 2272: Substring With Largest Variance Solution

Master LeetCode problem 2272 (Substring With Largest Variance), a hard challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2272. Substring With Largest Variance

Hard

Array Dynamic Programming

Problem Explanation

Explanation

To solve this problem, we can iterate through all substrings of the given string s and calculate the variance for each substring. For each substring, we count the occurrences of each character and find the difference between the maximum and minimum occurrence. We track the maximum variance seen so far and return it at the end.

We use two pointers to define the substring window.
We maintain a hashmap to keep track of the count of characters within the window.
We slide the window to cover all possible substrings and calculate the variance for each.

Time Complexity: O(N^2) where N is the length of the input string s. Space Complexity: O(26) - since we are using a hashmap to store the count of characters.

Solution Code

class Solution {
    public int largestVariance(String s) {
        int maxVariance = 0;
        for (int i = 0; i < s.length(); i++) {
            int[] count = new int[26];
            for (int j = i; j < s.length(); j++) {
                count[s.charAt(j) - 'a']++;
                int maxCount = 0, minCount = Integer.MAX_VALUE;
                for (int c : count) {
                    if (c > 0) {
                        maxCount = Math.max(maxCount, c);
                        minCount = Math.min(minCount, c);
                    }
                }
                maxVariance = Math.max(maxVariance, maxCount - minCount);
            }
        }
        return maxVariance;
    }
}

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